PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/block/partitions/osf.c b/block/partitions/osf.c
new file mode 100644
index 000000000..2a692584d
--- /dev/null
+++ b/block/partitions/osf.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/osf.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+
+#define MAX_OSF_PARTITIONS 18
+#define DISKLABELMAGIC (0x82564557UL)
+
+int osf_partition(struct parsed_partitions *state)
+{
+	int i;
+	int slot = 1;
+	unsigned int npartitions;
+	Sector sect;
+	unsigned char *data;
+	struct disklabel {
+		__le32 d_magic;
+		__le16 d_type,d_subtype;
+		u8 d_typename[16];
+		u8 d_packname[16];
+		__le32 d_secsize;
+		__le32 d_nsectors;
+		__le32 d_ntracks;
+		__le32 d_ncylinders;
+		__le32 d_secpercyl;
+		__le32 d_secprtunit;
+		__le16 d_sparespertrack;
+		__le16 d_sparespercyl;
+		__le32 d_acylinders;
+		__le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
+		__le32 d_headswitch, d_trkseek, d_flags;
+		__le32 d_drivedata[5];
+		__le32 d_spare[5];
+		__le32 d_magic2;
+		__le16 d_checksum;
+		__le16 d_npartitions;
+		__le32 d_bbsize, d_sbsize;
+		struct d_partition {
+			__le32 p_size;
+			__le32 p_offset;
+			__le32 p_fsize;
+			u8  p_fstype;
+			u8  p_frag;
+			__le16 p_cpg;
+		} d_partitions[MAX_OSF_PARTITIONS];
+	} * label;
+	struct d_partition * partition;
+
+	data = read_part_sector(state, 0, &sect);
+	if (!data)
+		return -1;
+
+	label = (struct disklabel *) (data+64);
+	partition = label->d_partitions;
+	if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	npartitions = le16_to_cpu(label->d_npartitions);
+	if (npartitions > MAX_OSF_PARTITIONS) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	for (i = 0 ; i < npartitions; i++, partition++) {
+		if (slot == state->limit)
+		        break;
+		if (le32_to_cpu(partition->p_size))
+			put_partition(state, slot,
+				le32_to_cpu(partition->p_offset),
+				le32_to_cpu(partition->p_size));
+		slot++;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	put_dev_sector(sect);
+	return 1;
+}